Abstract
Rise and decline in populations of Neodiprion pratti (Dyar) have been attributed most frequently to the influence of natural control factors. However, data obtained from 1963 through 1970 indicate that population densities are due to the sex attractiveness of the female sawfly. It was shown that the female emits a potent sex pheromone which was apparently necessary for mating. Unmated females oviposited only 17% of their egg potential, whereas mated females oviposited more than 90% of their total egg complement. Severe tree defoliation occurred when more than 50% of the females mated.
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